Rock-drill.



.L. H. JENKINS.

ROGK DRILL.

PPLIUATION FILED 00T. 24. 1907.

Patented Feb. 23, 1909.

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L. H. JENKINS.

ROCK DRILL.

APPLIOATION FILED 00T. 24, 1907.

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L. H. JENKINS.

ROCK DRILL.

APPLIUATIOH FILED 00T. 24, 1907.

913,389. Patented Feb. 23, 1909'.

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L. H. JENKINS.

ROCK DRILL.

APPLIoA'TIoN FILED 00T. 24, 1907.

Patented Feb. 23, 1909.

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L. H, JENKINS. ROCK DRILL. APPLIQATION FILED 00T. 24, 1907.

- Patented Feb, 1909.

ITNESSES mw L. H. JENKINS.

Roux DRILL. APPLICATION FILED 00T. 24, 1907. f 913,389. Patented Feb. 23, 1909.

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LEONA H. JENKINS, OF PHILADELPHIA, PENNSYLVANIA.

ROCK-DRILL.

Specification of Letters Patent.

Patented Feb. 23, 1909.

Application led October 24, 1907. Serial No. 398,959.

To all whom it may concern:

Be it known that I, LEONA` H. JENniNs, a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Rock-Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in rock drills, an object of the invention being to provide a spring-actuated drill with improved means for actuating and controlling the reciprocating and also the rotary motion of the drill rod.

A further object is to improve and simplify various parts of the structure as here-l inafter specifically explained.

`With these objects in view the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of the body of the machine with the side cover plate removed and showing the structure of the casing and the relative arrangement of various parts of the mechanism. Fig. 2 is a vertical sectional View on the line :v of Fig. 1. Fig. 3 is a rear view partly in section. Fig. 1- is a horizontal sectional view. Fig. 5 is a transverse sectional view through the lower portion of the machine. Fig. 6 is a side elevation looking at the opposite side of the machine from that shown in Fig. 1. Fig. 7 is an enlarged det-ail sectional view of portions of the devices for rotating the drill rod. Fig. 8 is a detail View of the pin which cooperates with the cam to cont-rol the movements of the drill rod, and Fig. 9 is an elevation on a smaller scale illustrating the complete machine.

1 represents a supporting post or jack of any preferred form of construction, but preferably having a curved arm 2 at its upper end to engage the roof of the chamber of rock in which the drill is to be operated. A foot 3 is adjustably attached to the post 1 and a toothed arm 4t connected with said foot is adapted to engage a base block 5 on which the foot 0f the post is located. A bar 6 is supported by the post 1, and with one end of this bar, a frame 7 is connected and adapted to be adjusted longitudinally of a screw S.

The details of construction of the devices thus far referred to are fully shown and described in Letters-Patent granted to me on the 19th day of November 1896 and designated by No. 571,231.

The casing 9 (which contains and incloses the drill operating mechanism) is made of strong wrought steel and provided with a bracket 10 on one side for the reception of a guide bar 11 which constitutes a portion of the frame 7 and on which, said casing can be adjusted vertically by means of a screw, as also fully disclosed by my former patent to which I have above referred.

Split blocks, 12, are located within the casing 9 for the accommodation of a shaft 13, one end of which projects beyond the casing, where it is provided with a suitable clutch 14 for attachment of a flexible shaft 15, receiving motion from a suitable motor (preferably an electric motor) 1G, as clearly shown in Fig. 9. The outer or forward end of the shaft 13 terminates in an integral disk 17 located within a chamber 18 in the casing, and provided with a forwardly projecting peripheral flange 19. A cam block 2O is secured to the flanged disk 17 and the heel of this cam is made with a hardened surface.

Parallel guide bars 21, 21, are securely bolted in the casing 9 and project some distance above the same. These guide bars are made with grooves 22 in which guide ribs or flanges 23 of a cross-head 211, move vertically. This cross head is made in a single piece of steel and carries a pin 25 which projects into the path of the cam block 2O so as to be actuated in one direction thereby. The pin 25 is made with an angular portion 2G seated in a similarly shaped socket in the cross head, and with a shank 27 having a threaded end to receive a nut 2S for preventing longitudinal displacement of the pin, said nut being housed within a recess 29 in the wall of the cross head. The portion 30 of the pin, which projects into the path of the cam so as to be engaged thereby, is hardened on its lower edge only, and is also preferably made with a flat face 31. From the above description, it will be seen that the heel of the cam is hardened where the pin drops off, and that the pin is also hardened where it engages the cam just before dropping of the same. That portion of the casing 9 within which the cross head operates, constitutes a part of the chamber 1S hereinbefore referred to7 and the top of this chamber, over the cross head is closed by a platev 32 secured between the guide bars 2l, the sides of said chamber beingy closed bythe cover plates 21l of the casing. The bottom of the chamber 18 is made with a recess or cushion cup 33, the lower part of which contains `Para rubber and rawhide 33a. 'The cross head 24 is provided at its-lower end with an annular projection or plunger 34 adapted to enter the recess or cup 33 and en gage the rubber. and rawhide therein, when the cross head completes its downward throw. vIt will be observed however, that the cup 33 and liano'e lor plunger 34 constitute yan efficient dagli-pot structure. Thus, when the cross head 24 descends, the flange orplun ger 34 entering the cup 24 will tend to. check 4the movement of the cross head, and as theair and lubricant which may be contained in the cup .becomes `eX-pelled from the cup33, the plunger .will'be fully checkedand will come to rest upon the rawhide and rubber in the bottom of said cup.

'With the construction and arrangement of parts as above described, it will be vseen that as the cross head reciprocates, lubricant containedl inthe chamber 1S will be agitated and so' thrown against the various `moving parts as to keep them thoroughly lubricated.

'A sleeve 38 projects upwardly through the center of the, recess 33 and communicates with a chamber 39 below the same, in the casing 9.` r1 his sleeve is also adapted to enter a recess 40 in the lower end of the cross head 24 when the latter descends.

"The cross head 24 is made with a socket 42 in which a block'43 is located, and the upper portion of the wall of said socket is threade'd'for the reception of a plug44, between which and the block 43,7disks45 may be placed to compensate for wear caused by .ac-

tion of the'drill rod 46 which is connectedV with the block 43. The vdrill rod 46V passes througha hole i-n the crossV head below the block v43 and its threaded upper end enters a threaded socket inf-said block. The. drill rod passes `downwardly from the cross head, through' the sleeve 38 and also through the lower chamber39- in the easing 9, the :lower endA of said rodv then passing through asuitable packing boX 47 secured to thebottom of the casing and isprovided at its free end with asu'itable chuck`48 for theI reception of a drill tool or bit 49.

"The plug. 44 :in the upper end. of the cross head, is provided with, a threaded ysocket for the. reception of theilower. end of a rod .50. This rod passes .upwardly through a stuffing boXv 51 vin the plate 32at the top of chamber 18 in casing 9, vand .is .provided vat a point above saidcasing with a crossI bar 51ZL disposedbetween the. guide bars .21, and made with. aknife edge 52. Another cross bar 53 is secured between the upper. ends of the guide bars .21 andl provided between itsends `mentl of the latter. through and upwardlyl beyond the sleeve G5 `which, the shaft 68 projects.

with an upwardly projected screw threaded arm 54. The threaded arm 54 passes freely through a'hole in o-ne arm 55 of a yoke 56 and a. lever nut 57 is screwed on the arm 54 over 'the arin The other arm 58 of the yoke 56 projects between the guide bars 21 `and is notched as at 59 to form a bearing l. upon .theknife edge cross-bar 51a.

The two members of the yoke 56 are hinged together at G0 and curve to form seats for a rubber .ion G2 by means of. an elongated gear `(i4 located in the lower portion of the casing 9. This gearis 4mounted on .a sleeve 65 which .y passes through the bottom lof the casingand is threaded at its lower end for the reception ofa nut 66. The upper end of the sleeve yis provided withan annular flange or head G7 countersunk in the upper end of thefgear 54 and serving to prevent vertical displace- A shaft G8 andtis preferably secured to said :sleeve by means of a suitable fastening device 69. T he upper endof the gearis provided with a circular series of ratchet teeth 70, and above said ratchet teeth, a disk- 71 is loosely mounted on the shaft G8 and provided with a circular series of ratchet -teeth 72 held normally in mesh with the ratchet teeth by means of` a spring 73' which encircles: the shaft G8 and bears .at its respective ends against the disk/T1 .andan abutment 7 4 into a socket in r)ihe disk 71 is provided with ank arm 7 5, to which one end ofa link 7G is pivotally attached, the other end of said link ,being connected with one member of a bell-crank-lever 7T. The other member of the bell-crank-lever is pivotally attached tov anarm-TS which projects from Lan eccentric stra a 79 the latter 'being mounted .upon and actuated {byan eccentric 8O on the main shaft 13. Motion is transmitted .from the eccentric 80 to` the ratchet :disk 71,

'through themedium of the devices above described, for the .purpose of oscillating said disk7 `and motion is imparted in one `direction .by saidratchet disk to the Ygear wheel 64. The4 gear Awheel is prevented from rotation in the reverse direction by pivoted dogs 8.1 which are pressed 'into engagement with the teeth of thegear :by means of springs 82.

'l/Vith the constructionand arrangement of parts hereinbefore described, it will be seen that the rotation ofy the mai-n shafti1-3 will cause the` cam 2 0 to. cooperate with the pin PRSSGS for the purpose of raising the cross head 2st and drill rod 46 and then release the same to the action of the spring 61 by means of which the blowl of the tool is effected. lt will also be observed that rotary motion of the tool is also effected by mechanism controlled by the main shaft 1 3.

The operation of the machine may be briefly described as follows lrlotion is transmitted from the electric motor to the shaft 13, through the medium of the flexible shaft, thus causing the cam 20 to turn to the right and drive the point of the cam under the pin 25. As the cam continues to turn, the pin will be lifted toward the center of the cam shaft 13 and the cross head 24 will be raised. rIhe spring 61 in the yoke will be compressed during the upward movement of t-he cross head and the drill rod will then be raised or withdrawn by the latter. The cam 20 continues to turn, raising the pin and cross head, until the toe of the cani passes from under the pin, (the latter being about threefourths of an inch to the left of the center of the cam shaft), when their two edges were parallel to each other, and without releasing the spring, the pin drops oft' the heel of the cam and the spring then delivers its force to the drill rod, driving it hard toward the rock. vWhile the above movements were taking place, the devices for effecting rotary motion of the drill rod were operating as follows:

Then the drill rod made its lift or upward stroke, the eccentric SO began to move the arm 7S downwardly7 thus transniitting motion to the bell-crank-lever 77 and causing the latter (through the medium of the links 7 6) to actnate the ratchet disk 71 in a direction to turn the gear Gil. The gear Get will thus be turned a distance of one tooth, which motion is transmitted to the drill rod through the medium of the pinion 63. Dun ing the upward stroke of the eccentric arm 7 8 the ratchet disk will be raised to ride over the ratchet 'teeth 7 0 on the gear Gel (the latter being held from retrograde rotation by the dogs 81), and then assume its normal position, the drill rod having' thus been turned during its up stroke, and the devices which caused such turning movement of the drill rod caused to complete their operation and assume their normal positions during said up stroke of the drill rod, said devices being held from turning during the effectivo stroke of the drill rod by the action of the dogs 81.

Various slight changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scope and hence do not wish to limit ymyself to the precise details herein set forth.

Having fully described my invention what l claim as new and desire to secure by Letters-Patent, is

l. ln a drill, the combination with a casing and arms or bars projecting above the same, of a cross bead in said casing, a drill rod connected with said cross head, means for moving the cross head in one direction, a yoke comprising two members hinged together at one end, a spring between the members of the yoke, connections between one member of the yoke and the cross head, and means for adjnstably connecting the other member of the yoke with the outwardly projecting arms or bars on the casing.

Q. .ln a drill the combination with a casing, a cross bead therein, and a drill rod connected with said cross head, of parallel arms or bars projecting above the casing, a rod connected with the cross head and projecting above the casing, a cross bar on said rod and having a knife edge, a cross bar between the upper ends of said parallel arms or bars, a screw projecting upwardly from.

said last-mentioned cross bar, a yoke comprising two hinged members, means for adj ustably connecting one of said members with said screw, the other member of the yoke resting upon the knife edge cross bar, a spring between the yoke members, and means for raising the cross head to compress the spring yoke and then release said cross head to the action of said spring yoke.

ln a drill, the combination of a casing, a cross head movable therein, a cam for mov-l ing said cross head in one direction and a spring for moving it in the other direction, said cross head consisting of a single piece having a recess, a block in said recess, and a drill rod passing upwardly through the lower portion of the cross head and secured to said block.

+1. ln a drill, the combination with a casing, a cam, a cross head in the casing, and a pin projecting from the cross head and cooperating with the cam, of a block seated in the cross head, a drill rod passing downwardly through the lower portion of the cross head and secured to said block, a removable plug in the cross head over the block therein, disks interposed between said plug and block, a rod secured to the plug, and a spring connected with the casing and with said last mentioned rod.

ln a drill, the combination with a casing, of guide bars secured therein and projecting above the same, of a cross head movable between said guide bars, a drill rod secured to said cross head, an upwardly projecting rod also secured'to the cross head and terminating above the casing, a knife edge cross bar at the upper end of said upwardly projecting rod, a yoke comprising hinged members, one of which rests upon said knife edge cross bar, a cross bar between the upper' ends of the guide bars, a

reiv en said last-mentioned -cross bar and adiustably connected With the other niember oit the yoke, a spring between the yoke membersj and means for moving the cross head to Withdraw the drill rod and compress said spring and then release the cross head to the action of said spring.

6. ln a drill,l the combination with a casing, a drill rod, means 'for reciprocating' the dril rod, ot a pinion on said drill rod7 a Wheel meshing with said pinien7 gear Wheel provided with ratchet teeth on one end, a ratchet disk engaging' saiLt ratchet teeth, a bell-crank-lever, a link connecting one member of said lever With the ratchet disk an eccentric a connection beWeen said eccentric and the other member or the bellcranllz-lever, and means for preventing retrograde rotation of tne gear Wheel.

7. In a drill, the combination with a casing, a. drill rod, and means for reciprocating,` the drill rod, of a pinion on the drill rod, -a sleeve secured to the casing, a gear Wheel elsee mounted on said sleeve and meshing` With said pinion7 a flange on the upper end of said sleeve and engaging the upper end of the gear Wheel, a fixed shaft passing through id sleeve] ratchet teeth on the upper end oi? the gear Wheel7 a ratchet disk mounted on said aft spring' pressing said disk t0- ivard the ratchet teeth on the gear Wheel, an arm on said disk, a bell-crank-leveii, alink connecting one member of said lever with th arm on Vthe ratche' disk, an eccentric, an arm cennecting` the strap of said eccentric with the other a in of said bell-crank-lever, and means for preventing` retrograde rotation of said gear Wheel.

testimony whereof7 have signed this siliccilication in the presence of two subscribing Witnesses.

LEONA H. JENKINS.

ll/Yitnesses JOHN lV. RITTER, WM. F. JENKINS. 

